Google Cloud Platform - How to Create Cloud Functions with Pub/Sub Trigger

In this article, you will learn "How to Create Cloud Functions with Pub/Sub Trigger based events" whenever a new Pub/Sub message is sent to a specific topic in Google Cloud Platform.

The Cloud Function is triggered when a message is published to a Pub/Sub topic so event is: google.pubsub.topic.publish

What is Cloud Pub/Sub?
Google Cloud Pub/Sub is a fully-managed, scalable, global and secure messaging service that allows you to send and receive messages among applications and services. You can use Cloud Pub/Sub’s to integrate decoupled systems and components hosted on Google Cloud Platform or elsewhere on the Internet.

What is Cloud Functions?
Cloud Functions are a serverless computing service offered by Google Cloud Platform (GCP) which are an easy way to run your code in the cloud.

It supports Java, Python, Ruby, Node.js, Go, PHP and .Net.

Currently, Google Cloud Functions support events from the following providers- HTTP, Cloud Storage, Cloud Firestore, Pub/Sub, Firebase, and Stackdriver.

Gen1 is more lightweight, one concurrency per instance, simple features and less knob to tweak, cheaper, it's pretty much deploy and forget, it is actually an AppEngine standard,

while gen2 is on Cloud Run (on GKE), you have more control, up to 1k concurrency per instance, larger resources, longer timeouts, etc, If you don't need it, just use gen1.

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